#!/bin/bash
s=0
i=0

while [ $i -le 100 ];
do
    s=$(($i+$s))
    i=$(($i+1))
done
echo $s


j=0
su=0
until [ $j -gt 100 ]; do
    su=$(($j+$su))
    j=$(($j+1))

done
echo $su
read -t 30 -p "please enter a :" a